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首页> 外文会议>Appita Annual Conference and Exhibition incorporating the ISWFPC(International Symposium on Wood, Fibre and Pulping Chemistry) vol.2: 13th ISWFPC Sessions - Oral Papers; 20050516-19; Auckland(NZ) >Vibrational spectroscopic analysis of successive structural change of lignin during alkaline oxygen treatment
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Vibrational spectroscopic analysis of successive structural change of lignin during alkaline oxygen treatment

机译：碱氧处理过程中木质素连续结构变化的振动光谱分析

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For the fundamental study of lignin degradation by alkaline oxygen treatment, softwood kraft lignin was subjected to the treatment. Along with the progress of the treatment, two different spectral changes were observed on the UV-Visible spectra. These spectral changes could be recognized as proceeding along certain temporal functions, which expressed by two second-order decays with different half-life (182 and 473 minutes). And each spectral change was defined as 'fast change' and 'slow change' respectively. The fitting study of infrared attenuated total reflectance (ATR) spectra with these temporal functions gave corresponding infrared ATR spectral components of fast and slow changes. The infrared ATR spectral component of fast change implied the generation of muconate derivative from phanolate substructure. This implication was strongly supported by the constant value of total protons on unsaturated and aromatic system and by the decrease of methoxyl group during fast change. On the other hand, it was suggested that aromatic structure of lignin was further degraded during slow change.
机译：对于碱性氧处理木质素降解的基础研究，对软木牛皮纸木质素进行了处理。随着处理的进行，在紫外可见光谱上观察到两个不同的光谱变化。这些光谱变化可以看作是沿着某些时间函数进行的，这些时间函数由两个具有不同半衰期（182和473分钟）的二阶衰减表示。每个光谱变化分别定义为“快速变化”和“缓慢变化”。红外衰减全反射（ATR）光谱与这些时间函数的拟合研究给出了相应的红外ATR光谱分量的快速和缓慢变化。快速变化的红外ATR光谱成分暗示从酚盐亚结构生成粘康酸酯衍生物。不饱和和芳族体系中总质子的恒定值以及快速变化过程中甲氧基的减少都强烈支持了这种暗示。另一方面，提示木质素的芳香结构在缓慢变化期间进一步降解。

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